CN108602646B

CN108602646B - Rope for elevator

Info

Publication number: CN108602646B
Application number: CN201680080170.2A
Authority: CN
Inventors: 裴堜焕
Original assignee: Kiswire Ltd
Current assignee: Kiswire Ltd
Priority date: 2016-01-28
Filing date: 2016-04-07
Publication date: 2019-12-27
Anticipated expiration: 2036-04-07
Also published as: WO2017131288A1; CN108602646A; JP6625241B2; KR20170090171A; KR101843142B1; JP2019503322A

Abstract

The invention provides an elevator rope in which a fiber core having a high oil content is disposed in an empty space between a center strand and an inner layer strand or in an empty space between center strands to improve flexibility while maintaining properties such as high elasticity and low elongation. The rope comprises: a rope core including center strands and a fiber core, each of the center strands being formed by twisting wires; inner layer strands, each of which is formed by twisting wires, the inner layer strands being arranged around a core; and outer layer strands, each of which is formed by twisting a wire, the outer layer strands being arranged around the inner layer strands. The number of inner layer strands is ten and the number of outer layer strands is ten. The fiber core is arranged in at least one of an empty space between the center strand and the inner layer strand and an empty space between the center strands.

Description

Rope for elevator

Technical Field

The present invention relates to ropes for elevators, and more particularly to elevator ropes of the type: the fiber core having a high oil content is disposed in an empty space (empty space) between the center strands and the inner layer strands or in an empty space between the center strands, so that the flexibility of the rope is improved while maintaining the properties of the rope such as high elasticity and low elongation.

Background

Metal ropes are widely used in many applications, such as machines, buildings, ships, fisheries, mining, bridges, ropeways, elevators, etc. Fig. 1 shows the basic structure of a rope 10.

Referring to fig. 1, a prior art rope 10 includes an inner core 20 and outer layer strands 30 stranded around the inner core 20. Each outer layer strand 30 is formed by stranding a plurality of (root) wires 32 around a core wire 31 at a lay length. In the rope 10 shown in fig. 1, the outer layer strands 30 are formed as a single layer. However, the outer layer strands 30 may be formed in multiple layers.

Tension may be applied to the prior art rope 10 due to the load applied to the rope 10 along the length of the rope 10; or when the rope 10 slips or slides in the sheave, a load may be repeatedly applied to the rope 10, which causes the wires 32 of the outer layer strands 30 to rub against each other. Thus, the rope 10 may have a short fatigue life. In addition, if the corrosion-resistant plating of the rope 10 is damaged, the rope 10 may rust, and thus lubricating oil such as grease is applied to the rope 10.

The prior art rope may comprise a core containing grease and the grease may be supplied from the core containing grease to the outer strands. There are two types of cores: fibers and steels.

The fibre core may contain a relatively large amount of grease and thereby the flexibility of the rope may be increased. However, the fiber core has poor mechanical properties such as low breaking strength and high elongation.

Steel cores can be divided into two categories: a stand-alone rope core (IWRC) type with the core located in the central region of the rope, and a Center Fit Rope Core (CFRC) type with the IWRC strands disposed between the inner sides of the outer layer strands. Since the steel core is formed of steel, the steel core has good mechanical properties, such as high breaking strength, low elongation, and low rope shape deformation. For example, CFRC has a large metal cross-sectional area and is therefore widely used for ropes of high-rise building elevators. However, the steel core comprises a relatively small amount of grease and thus has a lower degree of flexibility compared to the fiber core.

Recently, the construction of super high-rise buildings is increasing, and thus the demand for elevator ropes for super high-rise buildings is also increasing. Since the elevator in the super high-rise building has a longer operation range than the elevator in the middle and high-rise building, the rope for the elevator in the super high-rise building is required to have a high safety factor, a high elastic modulus, and a low elongation. In addition, since the elevator in the super high-rise building operates at a high speed over a long range, the rope for the elevator in the super high-rise building needs to reduce vibration so that passengers can feel comfortable during the operation of the elevator or when passengers get on or off the elevator.

Disclosure of Invention

Technical problem

Providing an elevator rope that: the fiber core having a high oil content is arranged in the empty space between the center strands and the inner layer strands or in the empty space between the center strands, so that the flexibility of the rope is improved while maintaining the properties of the rope such as high elasticity and low elongation.

Solution scheme

According to one aspect of the present disclosure, a rope for an elevator includes: a rope core including a center strand and a fiber core, each of the center strands being formed by stranding a plurality of wires; inner layer strands arranged around the core, each of the inner layer strands being formed by stranding a plurality of wires; and outer layer strands arranged around the inner layer strands, each of the outer layer strands being formed by stranding a plurality of wires, wherein the number of the inner layer strands is ten, and the number of the outer layer strands is ten, and the fiber core is arranged in at least one of an empty space between the center strand and the inner layer strands and an empty space between the center strands (i.e., in an empty space between the center strand and the inner layer strands and/or in an empty space between the center strands).

The number of center strands may be three to five, and the number of fiber cores may be three to six. The fiber core may be disposed in a central region of the cord core and within a first imaginary circle tangent to the center strand.

The rope may have a grease content of about 1.5% to about 2.5%. The fiber core may include one of sisal, polypropylene (PP), Polyethylene (PE), ultra high molecular weight polyethylene (UHMPE), and aramid fibers.

Each of the center strands may include nine to nineteen wires. Each of the inner layer strands may include seven to nine wires. Each of the outer layer strands may include nineteen to twenty-six wires.

Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the invention.

Advantageous effects of the invention

According to one or more of the above-described embodiments, in the rope 100 of the embodiment, the fiber core 112 having a relatively high content of grease is arranged in the empty space between the center strands 111 and the inner layer strands 120 or in the empty space between the center strands 111. Thus, due to the relatively high grease content, the rope 100 may have high flexibility and a long fatigue life while maintaining the mechanical properties of the rope with a steel core, such as high elasticity and low elongation (e.g., the mechanical properties of a CFRC rope).

In addition, according to the embodiment, the grease content of the fiber core 112 disposed in the empty space between the center strand 111 and the inner layer strand 120 or the empty space between the center strands 111 is adjustable, and therefore, the grease content of the rope 100 can be easily adjusted and controlled according to the environment in which the rope 100 is used.

In addition, according to an embodiment, the fiber core 112 may be disposed in a central region of the core 110 of the rope 100, and thus, grease may be gradually supplied to the outside. Therefore, even when the rope 100 is used under high-speed conditions, grease does not scatter (spread) from the rope 100. Therefore, the rope 100 of the embodiment may have high quality and may be used for elevators of super high-rise buildings.

Drawings

These and/or other aspects will become more apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a view showing a prior art rope;

fig. 2 is a cross-sectional view showing a prior art cordage product having a structure of 10 × 26WS +10 × 7+1 × 36 WS;

fig. 3 is a cross-sectional view showing a rope having a structure of 10 × 19S +10 × 7+ (3 × 9W +3F) according to an embodiment, the rope core including three center strands and three fiber cores;

fig. 4 is a cross-sectional view showing a rope having a structure of 10 × 19S +10 × 7+ (3 × 12W +3F) according to an embodiment, the rope core including three center strands and three fiber cores;

fig. 5 is a cross-sectional view showing a rope having a structure of 10 × 19S +10 × 7+ (3 × 15S +3F) in which the core includes three center strands and three fiber cores, according to an embodiment;

fig. 6 is a cross-sectional view showing a rope having a structure of 10 × 19S +10 × 7+ (4 × 9W +4F) +1FC, the rope core including four center strands and five fiber cores, according to an embodiment; and is

Fig. 7 is a cross-sectional view showing a rope having a structure of 10 × 19S +10 × 7+ (5 × 9W +5F) +1FC according to an embodiment, the rope core including five center strands and six fiber cores.

Detailed Description

Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. In this regard, the present embodiments may have different forms and should not be construed as limited to the description herein. Accordingly, the embodiments described hereinafter with reference to the drawings are only intended to explain aspects of the present specification. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. An expression such as "at least one of" when used before a list of elements modifies the entire list of elements rather than modifying individual elements of the list.

One or more embodiments provide a rope for an elevator. In the rope, a fiber core having a high oil content is disposed in an empty space between the center strands and the inner layer strands or in an empty space between the center strands, thereby improving flexibility of the rope while maintaining properties of the rope such as high elasticity and low elongation. Hereinafter, embodiments will be described with reference to the accompanying drawings.

Referring to fig. 3, according to an embodiment, a rope 100 comprises: a rope core 110 comprising a center strand 111 and a fiber core 112; inner layer strands 120; and outer layer strands 130.

The core 110 comprises a center strand 111 and a fiber core 112. Each of the center strands 111 is formed by stranding a plurality of wires 1. For example, each of the center strands 111 may be formed by stranding nine to nineteen wires 1. The center strand 111 may have a coreless warrington (W) structure such as 9W, 12W, or 19W.

However, the structure of the center strand 111 is not limited thereto. For example, the center strand 111 may have a sirocco (S) structure. For example, the center strand 111 may have a 15S, 17S, or 19S structure. The warrington and the west-donut structures are known in the art, and therefore, a description thereof will be omitted herein.

The fiber core 112 may have a grease content of about 10% to about 35%. Grease in the fiber core 112 is supplied to the inner layer strands 120 and the outer layer strands 130. The supply of grease increases the flexibility of the rope 100 and prevents a reduction in the fatigue life of the rope 100. In addition, due to the supply of grease, the rope 100 may not rust even if the plating of the rope 100 is damaged.

The fiber core 112 may include natural fibers such as sisal (sisal). However, the fiber core 112 is not so limited. That is, the fiber core 112 may include other types of fibers. For example, the fiber core 112 may include a rayon fiber selected from the group consisting of polypropylene (PP), Polyethylene (PE), ultra high molecular weight polyethylene (UHMPE), and aramid fibers. For example, if the fiber core 112 comprises UHMPE or aramid fibers, the breaking strength of the rope 100 can be increased and, thus, the fatigue life of the rope 100 can also be increased. For example, the fiber core 112 may include aramid fibers such as Kelvar, Technora, Tawaron, or Heracron.

The core 110 comprises a center strand 111 and a fiber core 112. In this case, the number of center strands 111 may be three to five, and the number of fiber cores 112 may be three to six, thereby effectively using the empty space of the core rope 110.

Each of the inner layer strands 120 is formed by stranding a plurality of wires 1. For example, each of the inner layer strands 120 may be formed by stranding seven to nine wires 1. The inner layer strand 120 may include seven wires 1 having a 1+6 structure (in which six wires are stranded around a central wire). However, the inner layer strands 120 may have a 9W structure. The structure of the inner layer strands 120 is not limited to the above-described structure, but may be variously selected depending on the situation and the desired performance.

Each of the outer layer strands 130 is formed by stranding a plurality of wires 1. For example, each of the outer layer strands 130 may be formed by stranding nineteen to twenty-six wires 1. The outer layer strands 130 may have a 19S structure if the rope 100 has a diameter of 12mm or less, and the outer layer strands 130 may have a 25Fi or 26WS structure if the rope 100 has a diameter of 12mm or more (25Fi refers to a filled (filler) structure, 26WS refers to a warringgulu structure, and a filled structure and a warringgulu structure are not described in detail herein since they are known in the art.

The inner layer strands 120 are arranged around the core 110, and the number of the inner layer strands 120 is ten. Outer layer strands 130 are arranged around inner layer strands 120, and the number of outer layer strands 130 is ten. That is, the core 110, the inner layer strands 120, and the outer layer strands 130 are arranged in this order (from inside to outside).

In the structure in which the inner layer strands 120 are arranged around the core 110, empty spaces are formed between the center strands 111 and the inner layer strands 120. In addition, since the number of the center strands 111 of the core 110 is three to five, empty spaces are formed between the center strands 111. The fiber core 112 is arranged in the empty space.

Referring to fig. 3-7, the fiber core 112 may be disposed in a central region of the core 110 and within a first imaginary circle 140 tangent to the center strand 111. When the number of the center strands 111 is four or more, the fiber core 112 may be arranged in the central region of the core 110, and in this case, the fiber core 112 may be arranged in the central empty space between the center strands 111. As described above, the fiber core 112 may be arranged within the first imaginary circle 140. However, the arrangement of the fiber core 112 is not limited thereto.

For example, if there is an empty space between the center strand 111 and the inner layer strands 120, the fiber core 112 may be arranged outside the first imaginary circle 140. The fiber core 112 may be compressed so as to be disposed between the center strand 111 and the inner layer strands 120.

A prior art core rope product 200 of the type of a core rope inlay (CFRC) shown in fig. 2 comprises ten 26WS outer strands, ten 7-wire (7-wire) inner strands and 36WS center strands. Based on the prior art rope product 200, the rope 100 of the example is provided by replacing the 36WS center strand with a core 110 comprising three to five center strands 111 and a fiber core 112 impregnated with grease.

The structure of the rope 100 of the embodiment can be expressed as follows:

example ropes: 10X 26WS + [10 XA + (NXB + NXF) + FC ]

Wherein N is an integer ranging from 3 to 5, a means a strand comprising seven to nine wires, respectively, B means a strand comprising nine to nineteen wires, respectively, and F means a fiber core.

That is, a refers to the inner layer strands 120, B refers to the center strands 111, and F refers to the fiber core 112. And 10 x 26WS refers to outer layer strands 130. In the expression of the rope of the embodiment, FC means the fiber core 112 located at the center of the rope core 110, and F means the fiber core 112 located between the center strand 111 and the inner layer strand 120.

The rope 100 of the embodiment may have a CFRC structure formed by simultaneously twisting a center strand, an inner layer strand, and an outer layer strand. That is, the CFRC rope can be manufactured by arranging inner strands around a center strand, arranging outer strands between outer sides of the inner strands, and simultaneously twisting the strands.

The rope 100 of the embodiment may be manufactured by the following stranding process. After the fiber core 112 is impregnated with grease, the cord 110 is formed by disposing the fiber core 112 in the vacant space of the cord 110. Then, ten inner layer strands 120 and ten outer layer strands 130 are simultaneously laid out and twisted around the core 110. In this manner, the rope 100 may be manufactured.

The rope 100 may have a grease content of about 1.5% to about 2.5%. The grease content of the fiber core 112 of the rope 100 is adjustable, and therefore, the grease content of the rope 100 can be adjusted by adjusting the grease content of the fiber core 112 according to the environment or condition in which the rope 100 is used. In this manner, the grease content of the rope 100 may be maintained in a range of about 1.5% to about 2.5%. If the grease content of the rope 100 is too low (e.g., less than about 1.5%), the flexibility or fatigue life of the rope 100 may decrease, or the rope 100 may rust. If the grease content of the rope 100 is too high (e.g., greater than about 2.5%), grease may leak and be scattered. Thus, the grease content of the rope 100 may be adjusted in the range of about 1.5% to about 2.5% by using the fiber core 112.

Now, the rope 100 will be described according to an embodiment. The following examples are for illustrative purposes only and are not intended to limit the scope of the inventive concept.

Fig. 2 shows a prior art cordage product 200 having a structure of 10 × 26WS +10 × 7+1 × 36 WS. Fig. 3-5 show a rope 100 in which the core 110 comprises three central strands 111 and three fibre cores 112. That is, the rope 100 shown in fig. 3 has a structure of 10 × 19S +10 × 7+ (3 × 9W +3F), the rope 100 shown in fig. 4 has a structure of 10 × 19S +10 × 7+ (3 × 12W +3F), and the rope 100 shown in fig. 5 has a structure of 10 × 19S +10 × 7+ (3 × 15S + 3F). Fig. 6 shows a core 110 comprising four center strands 111 and five fibre cores 112. That is, the rope 100 shown in fig. 6 has a structure of 10 × 19S +10 × 7+ (4 × 9W +4F) +1 FC. Fig. 7 shows a rope 100 in which the core 110 comprises five center strands 111 and six fiber cores 112. That is, the rope 100 shown in fig. 7 is 10 × 19S +10 × 7+ (5 × 9W +5F) +1 FC.

The rope 100 of the example was compared with a prior art rope product 200 (see fig. 2) to evaluate the content of grease and the flexibility of the rope 100, and the comparison results are shown in table 1 below. In table 1, the content of grease in the rope and the content of grease in the core were measured by a weighing method in which the weight of the rope and the weight of the core were measured before and after the removal of grease.

[ Table 1]

In table 1, the test results obtained when the oil content of the fiber core 112 was 15% are shown first, and the test results obtained when the oil content of the fiber core 112 was 30% are shown immediately thereafter. For example, in the case of the rope 100 shown in fig. 7, when the grease content of the fiber core 112 is 15%, the grease content of the rope 100 is 1.3 times the grease content of the prior art rope product 200, and when the grease content of the fiber core 112 is 30%, the grease content of the rope 100 is 2.1 times the grease content of the prior art rope product 200.

Referring to table 1, the rope 100 shown in fig. 7 has a grease content (five center strands 111 and six fiber cores 112) that is 1.3 times to 2.1 times the grease content of the prior art rope product 200. As described above, the grease content of the rope 100 of the embodiment is greater than that of the rope product 200 of the related art, and the grease content of the rope core 110 of the embodiment is also increased.

The rope 100 of the embodiment has the following effects.

The prior art ropes with a steel core have a relatively low content of grease compared to ropes with a fibre core. As a result, these ropes have low flexibility and short fatigue life and may rust.

However, in the rope 100 of the example, the fiber cores 112 having a relatively high content of grease are arranged in the empty spaces between the center strands 111 and the inner-layer strands 120 or in the empty spaces between the center strands 111. Thus, due to the relatively high grease content, the rope 100 may have high flexibility and a long fatigue life while maintaining the mechanical properties of the rope with a steel core, such as high elasticity and low elongation (e.g., the mechanical properties of a CFRC rope).

In addition, since the core 110 of the rope 100 of the embodiment is formed of the center strand 111 and the fiber core 112, the flexibility of the core 110 can be improved. In addition, since the fiber cores 112 impregnated with grease are arranged in the empty spaces between the center strands 111 and the inner layer strands 120, grease can be supplied to the inner layer strands 120 and the outer layer strands 130, and therefore, the flexibility of the rope 100 can be improved.

Because of the increased flexibility of the rope 100, the amount of bending stress in the rope 100 may be relatively small when the rope 100 is used and subjected to various loads under dynamic conditions, and thus, an elevator system using the rope 100 may be operated with relatively low traction.

In addition, the fiber core 112 may be disposed in the centermost (innermost) region of the wick 110 to gradually distribute grease while preventing the grease from flying or from being consumed too quickly. Thus, the grease may not be refilled, or refilling of the grease may be delayed. In addition, the fatigue characteristics of the rope 100 can be improved. Therefore, even when the rope 100 is used under high speed conditions, scattering of grease can be prevented. Therefore, the rope 100 of the embodiment may have high quality and may be used for elevators of super high-rise buildings.

Additionally, because the grease content of the fiber core 112 is adjustable, the grease content of the rope 100 may also be adjusted. That is, the grease content of the rope 100 can be easily adjusted and controlled according to the environment in which the rope 100 is used.

It is to be understood that the embodiments described herein are to be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects in each embodiment should generally be considered as available for other similar features or aspects in other embodiments.

Although one or more embodiments have been described with reference to the accompanying drawings, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the inventive concept as defined by the following claims.

Claims

1. A rope for an elevator of the center-inlaid-cord CFRC type, the rope comprising:

a rope core including a center strand and a fiber core, each of the center strands being formed by stranding a plurality of wires;

inner layer strands arranged around the core, each of the inner layer strands being formed by stranding a plurality of wires; and

outer layer strands arranged around the inner layer strands, each of the outer layer strands being formed by stranding a plurality of wires,

wherein the number of the inner layer strands is ten and the number of the outer layer strands is ten,

the fiber core is disposed in at least one of an empty space between the center strand and the inner layer strands and an empty space between the center strands,

the fiber core has a grease content of 10% to 35%, and

the rope for an elevator has a grease content of 1.5% to 2.5%.

2. A rope according to claim 1, wherein the number of central strands is three to five and the number of fibre cores is three to six.

3. A rope according to claim 1, wherein the fibre core is arranged in a central area of the core and in a first imaginary circle tangent to the central strand.

4. The rope of claim 1, wherein the fiber core comprises one of sisal, polypropylene PP, polyethylene PE, ultra high molecular weight polyethylene UHMPE, and aramid fibers.

5. The rope of claim 1 wherein each of the center strands comprises nine to nineteen wires.

6. A rope according to claim 1, wherein each of said inner layer strands comprises seven to nine wires.

7. The rope of claim 1 wherein each of the outer layer strands comprises nineteen to twenty-six wires.